<!DOCTYPE html>
<p>There should be no red, no scrollbar, and no crash or assertion failure.</p>
<div style="-webkit-columns:1; width:70%; -webkit-column-rule:10px solid red;">
    <div style="height:40px;"></div>
    <div style="-webkit-columns:1;">
        <div style="-webkit-columns:1;">
            <div></div>
            <div style="-webkit-column-span:all;"></div>
        </div>
    </div>
</div>
